Gasoline emissions may be 'worse air pollutant than diesel'

Washington,
Sat, 03 Mar 2012ANI

Washington, Mar 3 (ANI): The exhaust fumes from vehicles that run on gasoline contribute more to the production of a particular type of air pollution-secondary organic aerosols (SOA)-than those from diesel automobiles, a new study has revealed.

SOAs are tiny particles that are formed in air and make up typically 40 percent to 60 percent of the aerosol mass in urban environments. This is important because fine-particle pollution can cause human health effects, such as heart or respiratory problems.

"The surprising result we found was that it wasn't diesel engines that were contributing the most to the organic aerosols in LA," said Cooperative Institute for Research in Environmental Sciences (CIRES) research scientist Roya Bahreini, who led the study and also works at NOAA's Earth System Research Laboratory (ESRL).

"This was contrary to what the scientific community expected."

Researchers had already established that SOAs could be formed from gases released by gasoline engines, diesel engines, and natural sources-biogenic agents from plants and trees-but they had not determined which of these sources were the most important, she said.

"We needed to do the study in a location where we could separate the contribution from vehicles from that of natural emissions from vegetation," Bahreini said.

Los Angeles proved to be an ideal location. Flanked by an ocean on one side and by mountains to the north and the east, it is, in terms of air circulation, relatively isolated, Bahreini said.

At this location, the scientists made three weekday and three weekend flights with the NOAA P3 research aircraft, which hosted an arsenal of instruments designed to measure different aspects of air pollution.

"Each instrument tells a story about one piece of the puzzle," she said.

"Where do the particles come from? How are they different from weekday to weekend, and are the sources of vehicle emissions different from weekday to weekend?" she said.

From their measurements, the scientists were able to confirm, as expected, that diesel trucks were used less during weekends, while the use of gasoline vehicles remained nearly constant throughout the week.

The team then expected that the weekend levels of SOAs would take a dive from their weekday levels, Bahreini said.

But that was not what they found.

Instead the levels of the SOA particles remained relatively unchanged from their weekday levels. Because the scientists knew that the only two sources for SOA production in this location were gasoline and diesel fumes, the study's result pointed directly to gasoline as the key source.

"The contribution of diesel to SOA is almost negligible," Bahreini said.

"Even being conservative, we could deduce from our results that the maximum upper limit of contribution to SOA would be 20 percent."

That leaves gasoline contributing the other 80 percent or more of the SOA, Bahreini said.

"While diesel engines emit other pollutants such as soot and nitrogen oxides, for organic aerosol pollution they are not the primary culprit," Bahreini added.

The study will be published in Geophysical Research Letters, a journal of the American Geophysical Union. (ANI)